Detection of somatic TP53 mutation in surgically resected small-cell lung cancer by targeted exome sequencing: association with longer relapse-free survival

Hiroshi Yokouchi, Hiroshi Nishihara, Toshiyuki Harada, Shigeo Yamazaki, Hajime Kikuchi, Satoshi Oizumi, Hidetaka Uramoto, Fumihiro Tanaka, Masao Harada, Kenji Akie, Fumiko Sugaya, Yuka Fujita, Kei Takamura, Tetsuya Kojima, Mitsunori Higuchi, Osamu Honjo, Yoshinori Minami, Naomi Watanabe, Masaharu Nishimura, Hiroyuki SuzukiHirotoshi Dosaka-Akita, Hiroshi Isobe

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Objectives: Few reports have explored clinical biomarkers, including those identified by targeted exome sequencing (TES) of surgically resected small-cell lung cancer (SCLC) and correlation with patient survival. Patients and methods: We collected formalin-fixed paraffin-embedded tumor samples from 127 patients with SCLC who had undergone surgery and analysed nonsynonymous somatic gene mutation profiles by TES of 26 cancer-related genes using next-generation sequencing (NGS) and web databases (UMIN Registration No. 000010117). Results: We detected 38 nonsynonymous somatic tumor protein p53 (TP53) mutations in 43 (54.4%) patients. Among these TP53 lesions, we identified clinically relevant mutations including those encoding Y220C, R248W, R249M, M237I, and R273L substitutions in the p53 protein. These mutations have been reported to be associated with certain clinical outcomes or biology in other types of malignancies but not in SCLC. Moreover, nonsynonymous somatic mutations of TP53 were positively associated with relapse-free survival (RFS) (median, 17.33 months [95% confidence interval (CI), 3.86–30.79] in a mutation-positive group vs 10.39 months (6.96–13.82) in a mutation-negative group, p = 0.042). Multivariate analysis revealed that nonsynonymous somatic TP53 mutation was an independent factor of prolongation of RFS (hazard ratio: 0.51, 95% CI: 0.29–0.89, p = 0.019) but not overall survival (OS). Conclusion: These data suggested that TES may play a critical role for promoting reverse-translational studies, including investigations of the biology of TP53 mutations in different stages of SCLC. Accumulation of the data using cancer panels with a broader range of genes, including TP53, is expected to be useful for future clinical applications for patients with SCLC.

Original languageEnglish
Article numbere04439
JournalHeliyon
Volume6
Issue number7
DOIs
Publication statusPublished - 2020 Jul

Keywords

  • Bioinformatics
  • Cancer research
  • Clinical genetics
  • Clinical research
  • Genetics
  • Mutation
  • Next-generation sequencing
  • Oncology
  • Respiratory system
  • Small-cell lung cancer
  • Surgery
  • TP53

ASJC Scopus subject areas

  • General

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